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Thermal neutron capture on $sup 142$Ce

Journal Article · · Phys. Rev., C, v. 13, no. 4, pp. 1434-1445
OSTI ID:4012071
; ;

The $gamma$ ray spectrum from thermal neutron capture on $sup 142$Ce has been studied from 100 keV to 6.4 MeV. The $gamma$ rays were studied in singles and coincidence with Ge(Li) detectors. The results obtained together with information from the $sup 142$Ce(d, p)$sup 143$Ce reaction indicate the population by neutron capture of levels in $sup 143$Ce with energies 18.4 +- 0.5, 42.4 +- 0.6, (56.4 +- 1.0), 632.5 +- 0.5, 808.2 +- 0.3, 862.1 +- 0.3, 1154.1 +- 0.3, 1172.5 +- 0.3, 1572.4 +- 0.5, 1620.5 +- 0.4, 1628.7 +- 0.4, 1835.2 +- 0.8, 1913.4 +- 1.1, 1945.4 +- 0.6, 1993.3 +- 0.6, 2027.4 +- 0.8, 2061.5 +- 0.6, 2202.0 +- 0.6, 2215.9 +- 0.6, 2232.1 +- 0.7, 2272.7 +- 1.0, 2313.9 +- 0.8, 2488.6 +- 1.0, and 2537.3 +- 0.8 keV. The neutron separation energy of $sup 143$Ce was determined to be 5145.9 +- 0.5 keV, which is in poor agreement with values obtained from currently available mass tables. The $sup 143$Ce level scheme was found to be similar to that of other even Z, N = 85 nuclei with a small group of levels close to the ground state separated by 600--700 keV from the next level. Below 1600 keV it is possible to identify levels in $sup 143$Ce excited in both the (n, $gamma$) and (d, p) reactions. For those levels which have been assigned l/sub n/ = 1 in the (d, p) reaction, it was found that the strengths of excitation in the (n, $gamma$) and (d, p) reactions are strongly correlated as in the neighboring N = 83 nuclei $sup 139$Be and $sup 141$Ce. This result is interpreted as indicating that direct capture plays an important role in the mechanism of the $sup 142$Ce(n, $gamma$$)$$sup 143$Ce reaction. (AIP)

Research Organization:
Schuster Laboratory, University of Manchester, Manchester, United Kingdom
NSA Number:
NSA-33-031815
OSTI ID:
4012071
Journal Information:
Phys. Rev., C, v. 13, no. 4, pp. 1434-1445, Journal Name: Phys. Rev., C, v. 13, no. 4, pp. 1434-1445; ISSN PRVCA
Country of Publication:
United States
Language:
English

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